Zirconium, silicon alkali acid solution and method for stabilizing same



. Patented Oct. 15, 1935 I 7 2,017,125

OFFICE ZIRCONIUM, SILICON ALKALI AGED SOLU- AND METHOD FOR STABILEZING No Drawing. Application July 27, 1932, Serial No. 625,214

22 Claims. (01. 23-250) My invention relates to the preparation of zirapproximately the following chemical composiconium solutions containing silicon and alkali or tionz r alkaline earth metals of the group consisting of 7 08 barium, sodium and potassium and is especially Zirconium Oxide-l-traces of T102 etc.

UNITED STAT aimed at improved methods for stabilizing such (Zl'Oz-H 5-20 5 501111710108 when formed by adding thereto certain Silica (S102) 2-40 or anic compounds. Sodium Oxide (NazO) 3.60

In my pending application for patent filed 0c- Chloride calculated as HCl (I-ICl) 7.34 1 013 1 23, 1931, Serial No. 570,767, Patent No. Water (H20) 31-46 10 July 1933 I dlsclosed Improved math" It will be'seen that the hydrochloric acid used 10 Ods of converting the acid insoluble Zircon into is onl moderatel in excess of that theoretically compounds teadlly Soluble m dilute .acms m requir ed to form Zirconium into normal chloride, amount cnsldembly .less Fhan.theretmauy but even so, the zirconium and soda have been qwred compme Wlth Zirconium to form.the brought into solution with the silicon also in normal zirconium salt and with the alkali to solution. t, 15,, form a mmlal alkaih Salt Wlth,the acld' I have experimented with various organic acids I have since discovered improved methods and compounds but thus far have found that whereby these zirtzomum' Silicon ka or alkaltne tartaric acid is preferable as the stabilizing agent eairth metal 591111310115. be Stablhzed, among those in classification I have hereinbefore v tamed in fluid condition for long periods, and described. In practicing my improved methods 20 more mflportantly my mventlons permit of the I preferably take dilute acid soluble zirconium production of much more concentrated acid solusilicate compounds, f example, barium Zirconi tions of zirconium, silicon alkali or alkaline earth um Silicate f bl in the form f a wet mined metal The Solutions resultmg suspension in water and dissolve this in mineral o from my sta'blhzmg methods may be usedto acid, such as hydrochloric acid or nitric acid, into vantage in mineralizlng textiles of various kinds; which may be incorporated a suitable amount of the term mineralizing signifies the impregna' tartaric acid, or this tartaric acid may be added tion of silk, wool, cotton or other natural as well ft the solution f Zirconium compound is as synthetic textile and other like materials by made The Zircon s oo may be decomposed inorganic compounds so as to increase the weight, w an alkaline earth metal, Such as a barimn or to act as mordants in dyeing operations, or compound fo examine, barium carbonate again to render such material less susceptible to 33 and t resulting barium Zirconium 511ietc. cate dissolved in hydrochloric acid or nitric acid 35 I have discovered that the addition of suitable to produce a solution that may be stabilized by 35 organic material, preferably an organic comaddition of tartaric acid that will maintain the pound characterized as being readily water-solubarium and Zirconium along With Silicon in ble and containing carbon, hydrogen and oxygen, Solution I v with fewer carbon atoms than hydrogen atoms, It W found that the resultant mmemt 5 40 such as tartaric acid (1.1203406) to the practh solution will have become completely stabilized 40 cally clear acid solution (chloride solution) as set and m fluid for indefirtite. periods Having in this general way 1nd1cated the naa 21222 g gjggg is fi g i g g g gii i ture of my discoveries, I'will now set forth several 1 y detailed examples of how my improved methods P 1933, produces tne novel elTect of retarding or may be Dracticed to advantage with Various m wholly eliminating the tendency of the silicon era} a and organic'compounds whereby h compounds in such solution to form a thick gelatresuming acid mti containing zirconium, iniZed mass, and in some Cases the apparent silicon and alkali or alkaline earth fluxes may be so id ficat on of the so ut wh c S ou d be stabilized by adding suitable organic agents'to the )6 maintained in fluid condition for the purposes I end that stable solutions may be produced for the have ment1oned. This Example 13 solution has various uses I have mentioned. t

Example A Per cent Zirconium (calculated as ZIOz) 35.71 Silicon (calculated as $102) 18.68 Barium (calculated as 32.0) 45.05

The balance consisting of impurities such as A1203, TiO2, FezOa, etc. 200 parts by weight of the above product was wet-milled with 100 parts by weight of water to such fineness that all passed a 325 mesh sieve. Since the product is soft the milling is readily effected. Before discharging from the mill 100 parts by Weight of water was added to form a slurry or suspension of water insoluble barium zirconium silicate.

In obtaining this solution the following will illustrate the method as well as a comparison between the untreated solution and that treated according to my invention relating to stabilizing efiect of organic matter.

Example A (solution untreated) 63.0 parts by weight of hydrochloric acid of 35.5% HCL content, is diluted with 40 parts by Weight of water and the mix was heated to C.; parts by Weight of barium zirconium silicate suspension was then added with the solution nearly complete in a few minutes. Then 64 parts by weight of water was added. This charge was digested at about 95 C. and after 20 minutes the solution had set to a solid gel.

Example A (solution treated) Per cent Zirconium (calculated as ZlOz) 6.0 Silicon (calculated as SiOz) 3.0 Barium (calculated as BaO) 8 Chlorides (calculated as I-lCl) 8.4

Carbon (C) 0.12

Water (H2O) 74.48

This resultant solution was digested 1 hour at 95 C. and remained quite fluid and after cooling at room temperature has continued to remain fluid.

Example B 2.024 parts by weight of tartaric acid crystals (H2C4H40e) are dissolved in 86.00 parts by weight of hydrochloric acid of 35.5% I-ICl content. To this solution is added 100.00 parts by weight of a zirconium slurry made in the following manner:

A sodium zirconium silicate suspension in water is obtained by first wet milling sodium zirconium silicate with water to yield a suspension containing the following ingredients mainly suspended as 5 water insoluble materials.

Per cent Zirconium (calculated as ZrO2) 20.65 Silicon (calculated as SiOz) 10.49 Sodium (calculated as NazO) 14.06 10 Water etc 54.80

The solution is rapid and becomes quite hot. 15 However no thickening takes place and after standing for about 45 days, the solution was apparently just as fluid as when made because the tartaric acid had effectively prevented gelatization.

Zirconium silicon alkali chloride solution pre- 20 pared as in this example upon analysis has shown the following composition.

Per cent Zirconium (calculated at ZrO2) 10.53 25 Silicon (calculated as SiOz) 5.33

Sodium (calculated as NazO) 7.51 Carbon (C) 0.35 chlorides (cahulated as l-ICl) .l 16.24

Water 60.04 30 The above composition for this solution represents the result after settling out of small amount of insoluble matter: it is optional as to whether 35 this insoluble matter is removed or not. For example, a user of this chloride solution might prefer to purchase the sodium zirconium silicate compound and then prepare the solution as required for use; for some purposes it would be per- 40 missible to use the solution with the small amount of insoluble matter present, while in other cases it may prove preferable to allow it to settle and remove the solution from the settled insoluble matter. 45 The chloride solution of this Example B, after standing about 22 days, had according to analysis the following composition:

Per cent Zirconium (calculated as ZrOz) 10.43 50 Silicon (calculated as S102) 5.07 Sodium (calculated as NazO) 7.49 Carbon (C) 0.35 Chlorides (calculated as H01) 16.24 Water 60.42 55 It will be seen from above that solution is stable for almost all practical purposes. 60

I have observed, however, that as time progresses there is a gradual accumulation of salt; for some purposes it may be desirable to prepare the solution in more dilute form and as an extreme example of this I present the following 65 comparative Example C.

Example C 2.024 parts by weight of tartaric acid crystals are dissolved in 50 c. 0. water, and 86 parts by 70 weight of hydrochloric acid or" 35.5% I-ICl content is diluted with 200 c. 0. water. The diluent water may be heated so as to have the acid mix at about 65 C. To this dilute hydrochloric acid solution is added 100 parts by weight of the zirconium slurry 75 of Example B and when solution has progressed to a point where all soluble matter is in solution there is added the solution of 2.024 parts by weight tartaric acid dissolved in 50 c. 0. water.

After allowing the small amount of insoluble matter to settle, the essentially clear solution will have approximately the following composition:

I have had chloride solutions prepared as per example C under observation for period of six months and find that there is no deposition of salt, the solution remaining fluid and essentially clear.

By way of comparison a solution prepared using the same proportions as in Example C, except that 52 c. 0. water were added in place of solution of tartaric acid so as to have a solution of same concentration but without tartaric acid, was found gelatinized after four months.

Between the concentration of solutions as per examples B and C there is a wide range of permissible concentrations which could be prepared according to my methods, although I do not limit my improved methods within the range of these two examples. More dilute solutions can be made either directly or by dilution of stronger solutions.

In Examples B and C I chose hydrochloric acid as the solvent for the zirconium silicon alkali compound and stabilized the resultant solution by addition of tartaric acid. However, I am not limited to the use of the chloride solution and in the following examples I will show how other acids may be used as solvents.

Example D time the insoluble settled out leaving an essentially clear solution. About 20 cc. of this clear solution was placed in a test tube and maintained at about C. for six hours and there was no gelling of same. 7

The zirconium silicon alkali sulphate solution prepared according to Example D had a composition approximtely as follows:

Per cent Zirconium (calculated as Z1'O2) 6.5 Silicon (calculated as SiOz) 3.4 Sodium (calculated as NazO) 4.6 Carbon (C) I 0.21 Sulphates (calculated as H2SO4) 13.20 Water etc 72.09

The main part of the solution was left stand-.

ing at room temperature and has remained fluid under observation for a long period. This proves that the addition of tartaric acid has served to stabilize a zirconium silicon alkaii sulphate solution in much the same manner as in case of chloride solutions treated with tartaric acid, for in tests without the tartarioacid, such solutions set into a stiff gel in about 24 hours.

Example E 119.3 parts by weight of nitric acid (70% -HNO3) is diluted with 154 parts by weight of water and the solution is then preferably heated to about 65 C. 157.4-parts by weight of the zirconium slurry of Example B is now added and upon solution of soluble material there is add-ed 3.2 parts by weight of tartaric acid dissolved in 50.0 parts by weight of water. The solution was rapid and only a small amount of insoluble matter remained.

After settling out of this small amount of insoluble matter, about 20 c. 0. solution was heated in a test tube for about 6 hours at 95 C. and this solution remained fluid; the addition of tartaric acid has stabilized the solution and prevented the gelling of the silicon compounds, which would otherwise occur in an hour according to my tests.

The stabilized nitrate solution as producedin Example E was of approximate composition as In the preceding examples I have shown how my invention may bepra'cticed with sulphuric acid or with nitric acid.

As in case of chloride solutions I do not confine myself to the specific proportions of the examples or to the specific concentrations. More or less concentrated solutions may be made and the order of addition of one ingredient to am other, temperature of solutions, etc. may be widely varied. It is optional also whether or not the small amount of insoluble residue remains in solution or not.

I have also found that citric acid may be used to stabilize these solutions containing zirconium, silicon and alkali or alkaline earth metal in acid, but more is required and therefore I prefer to use tartaric acid.

I have also found that sodium zirconium tartrate had an efiect similar to tartaric acid and may be used instead of tartaric acid.

For example, about 3.8 parts by weight of sodium zirconium tartrate solution may be used to replace one part of tartaric acid in the examples given. Such sodium zirconium tartrate solution had approximately the following com- Example F I have also found that sugar (C12H22O11) may be Per cent Zirconium (calculated as ZlOz) 10.00 Silicon (calculated as SiOz) 5.00 Sodium (calculated as NazO) 4.35 Carbon (C) 0.32 Chloride (calculated as HCl) 12.30

' Water 68.03

used to stabilize the solution containing Zr, Si and alkali salts and will effectively retard or prevent gelatinization of solution. Sugar may for some purposes be objectionable because if the solution be heated for long period it tends to discolor.

685 parts by weight of 35.5% I-ICl are diluted with 66 parts by weight water and heated to about 60 C. 78.8 parts by weight of the zirconium slurry of Example B is added and stirred. The

'major or soluble portion dissolves readily and to this solution is added 1.24 parts by weight of sugar (0121422011) dissolved in 25 parts by weight of water.

This charge is left to settle and a sample of essentially clear solution heated at C. for 20 hours shows no evidence of gelling.

When the charge as in this example was made except that no sugar was used, a sample of solution obtained gelled to stiff mass within three hours.

In the foregoing examples I have shown methods of obtaining and stabilizing chloride, sulphate and nitrate solutions of zirconium silicon alkali or alkaline earth metal compounds of the group consisting of barium,sodium and potassium, using the zirconium compound as obtained by wet milling of the roasted mixture of ZISiO4 with alkali, without any attempt being made to remove such water dissolved salts as NazCOs, small amounts of sodium silicate, sodium aluminate and traces of other impurities.

Example G Per cent Zirconium (calculated as ZrOz) 52.42 Silicon (calculated as S102) 25.08 Sodium (calculated as NazO) 21.75

176 parts by weight of 35.5% hydrochloric acid are diluted with 195 parts by weight of water and the mixture warmed to about 60 C. parts by weight of this dry sodium zirconium silicate of above composition are stirred in, and the charge is then stirred to complete solution of soluble material. There is then added 5 parts by weight tartaric acid previously dissolved in 24 parts by weight of water.

This treatment produces a solution containing zirconium and silicon along with sodium which is less in proportion to zirconium and silicon than in the former examples. For example, the solution as prepared in this Example G will have the following approximate composition:

Solutions of this composition in respect to the proportion of zirconium, silicon and NazO should remain stable and freer of salt deposits as compared with Example B, and stronger or weaker solutions may be made to suit the requirements.

In this example as in the use of the unwashed 5 group of organic compounds that are charl5 acterized as being very soluble in water, and contain carbon, hydrogen and oxygen, with fewer carbon atoms than hydrogen atoms.

In the foregoing examples I have referred to sodium zirconium silicate as produced by roast- 2 0 ing finely milled zircon (ZrSiOr) with sodium carbonate. Other sodium alkali may be used, but NazCOs is preferable. In any event only enough alkali should be used to easily decompose the zirconium silicon material in such manner as 25;

to leave both soluble in dilute acids along with alkali metal compound.

Although I have referred to and prefer zircon (ZrSiO4) as the raw zirconium material, I wish it understood that other zirconium materials will 30.

serve.

Although I have referred to relatively pure zirconium products I wish it understood'that less pure or crude zircon or zirconium-containing materials may be used within the scope of my 35 invention.

Example H As an example how my invention may be practiced starting with zirconium oxide, silica and alkali I may mix the following ingredients: 40 parts by weight zirconium oxide, '70 parts by weight silica, and 200 parts by weight sodium carbonate.

The ZIO2 and SiOz should be of suitable fine ness, preferably at least 99 /2% passing through 45 325 mesh and these two materials are well mixed with the sodium carbonate (commercial soda ash).

The charge is roasted at about 920 C. for a period sufficient to decompose the ZrOz and S10: 50 and cause these to combine wtih the soda ash to yield a product soluble in dilute acids yielding zirconium, silicon and sodium in solution.

The roasted product obtained in this charge of about 304.6 parts by weight is of the following 55 approximate composition:

Per cent Zirconium (calculated as ZIOz) 43 Silicon (calculated as SiOz) 23 Sodium (calculated as NazO) 34 60 This product may be dry-milled to suitable fineness and is then added dry to the acid to 55 obtain a solution, or it may preferably be Wetmilled and dissolved as follows:

The 304.6 parts by weight of this dry-milled product is charged to a ball mill along with 294 parts by Weight of water, and the charge is milled 70 to a point where less than of 1% solids remain on 325 mesh sieve or to any fineness for convenient handling and easy solubility.

The small amount of water soluble material may be removed, or as in following part of this 75 1 only a little insoluble matter remains.

example the product may be dissolved direct. 86 parts by weight of hydrochloric acid containing 35.5% HCL and 2.024 parts by weight of tartaric acid crystals are added to the HCL and dissolved therein. 100 parts by weight of above mentioned zirconium slurry is added, and stirred until the soluble material is dissolved. The solution is rapid and charge becomes quite hot.

The solution will be found stable and may be used direct or the small amount of insoluble material present may be settled out.

The solution will have a composition approximating that of Example 13.

If the tartaric acid were omitted the charge would gel in a short time, and would be of no value as a solution source of zirconium, silicon, etc.

As in the preceding examples other organic matter may be used in place of tartaric acid.

The compound may if desired, be converted to sulphate or nitrate solution, and then stabilized in same manner as in the sulphate and nitrate examples.

This Example H shows how zirconium oxide and silica may be used as raw material, and is important in showing how if natural ZrOz ores were used the silica could be added to bring the ZrOzzSiOz ratio to about 65:35.

Example I I have also practiced my invention on solutions obtained from potassium zirconium silicate. 1000 parts by weight finely milled zircon is mixed with 67 6 parts potassium carbonate and heated at about 1000 C. until the zircon is decomposed and rendered soluble in dilute acids.

The roasted product will be of the following approximate composition:

The product is preferably wet-milled to suitable fineness with an equal weight of water.

In obtaining my solution I may proceed as follows: 73.5 parts by weight hydrochloric acid l (35.5% 1101 content) are diluted with 62 parts by Weight of water and warmed to about 70 C. and there is then added 100 parts by weight of this potassium zirconium silicate slurry.

The solution of soluble material is rapid and 2 parts by weight of tartaric acid were dissolved in 25 parts by weight of water and added to this acid solution.

This stabilized chloride solution had the fol- 1 lowing approximate composition:

Per cent Zirconium (calculated as ZrOz 8.0 Silicon (calculated as SiOz) 4.6

A small amount of this solution was heated in test tube at 95 C. for ten hours remained fluid served after about 72 hours and continued fluid for a long period of time thereafter.

I claim as my invention: 1. A method of converting zirconium'silicate or zircon into astabilized acid zirconium solu- 5 tion containing silicon and an alkali metal, which comprises decomposing said zirconium silicate mixed with said alkali through heating, treating the roasted product with nitric acid to solution of silicon and soluble zirconium compounds, sepa- 10 rating the clear acid liquor containing zirconium, silicon and alkali in solution, and adding a readily water-soluble organic compound selected from the group consisting of tartaric acid, citric acid, and sodium zirconium tartrate to stabilize same. 15

2. A method of converting zirconium silicate or zircon into a stabilized acid zirconium solution containing silicon and an alkali metal, which comprises decomposing said zirconium silicate mixed with said alkali through heating, treating 20 a readily water-soluble organic compound select- 25 ed from the group consisting of tartaric acid, citric acid, and'sodium zirconium tartrate to stabilize same.

7 3. In the method of forming a stabilized acid zirconium solution containing silicon and a'30 barium compound, the steps which comprise treating an aqueous zirconium-silicon-barium solution with hydrochloric acid, and then mixing therewith a readily water-soluble organic compound selected from the group consisting of tar- 85 3 taric acid, citric acid, and sodium zirconium tartrate to stabilize same.

4. In the method of forming a stabilized acid zirconium solution containing silicon and a barium compound, the steps which comprise 40 treating an aqueous zirconium-silicon-barium solution with nitric acid, and then mixing therewith a relatively water-soluble organic compound selected from the group consisting of tartaric acid, citric acid, and sodium zirconium 45 tartrate to stabilize same.

5. A method of converting zirconium silicate or zircon into a stabilized acid solution containing soluble compounds of zirconium, silicon and of a metal selected from the group consistingof barium, sodium and potassium, which comprises heating said zirconium silicate mixedvwith an alkali compound of said metal to substantial complete decomposition, treating the roasted product with mineral acid to bring into solution soluble 5 compounds of zirconium, silicon and'said metal, separating therefrom the clear acid liquor, and adding to said liquor a' readily water-soluble organic compound selected fromthe group consisting of tartaric acid, citric acid, and sodium zirconium tartrate to stabilize same.

6. A method of converting zirconium silicate or'zircon into astabilized acid solution containing soluble compounds of zirconium, silicon and of a metal selected from the group consisting of barium, sodium and potassium, which comprises heating said zirconium silicate mixed with an alkali compound of said metal to substantial complete decomposition, treating the roasted product with hydrochloric acid to bring into solution soluble compounds of zirconium, silicon and said metal, separatingtherefrom the clear acid liquor, and adding to said liquor a readily water-soluble.

organic compound selected from the group 0011* sisting of tartaric acid, citric acid, and sodium zirconium tartrate to stabilize same.

7. A method of converting zirconium silicate or zircon into a stabilized acid solution containing soluble compounds of zirconium, silicon and of a metal selected from the group consisting of barium, sodium and potassium, which comprises heating said zirconium silicate mixed with an alkali compound of said metal to substantial complete decomposition, treating the roasted product with mineral acid to bring into solution soluble compounds of zirconium, silicon and said metal, separating therefrom the clear acid liquor, and adding to said liquor tartaric acid to prevent gelatinization of the silicon compounds therein whereby such acid solution is stabilized.

8. In the production of a stabilized acid solution containing soluble compounds of zirconium, silicon and of a metal selected from the group consisting of barium, sodium and potassium, the steps which comprise treating an aqueous suspension containing decomposed compounds of zirconium, silicon and said metal with mineral acid, and then mixing therewith a readily water soluble organic compound selected from the group consisting of tartaric acid, citric acid, and sodium zirconium tartrate to stabilize same.

9. In the production of a stabilized acid solution containing soluble compounds of zirconium, silicon and barium, the steps which comprise treating an aqueous suspension containing decomposed compounds of zirconium, silicon and barium with mineral acid, and then mixing ,therewith a readily water soluble organic compound selected from the group consisting of tartaric acid, citric acid, and sodium zirconium tartrate to stabilize same.

10. In the production of a stabilized acid solution containing soluble compounds of zirconium, silicon and of a metal selected from the group consisting of barium, sodium and potassium, the steps which comprise treating an aqueous suspension containing decomposed compounds of zirconium, silicon and said metal with hydrochloric acid and then mixing therewithrtartaric acid to prevent gelatinization or the silicon compounds whereby such acid solution is stabilized.

11. In the production of a stabilized acid solution containing soluble compounds of zirconium, 50

silicon and of a metal selected from the group consisting of barium, sodium and potassium, the steps which comprise treating an aqueous suspension containing decomposed compounds of zirconium, silicon and said metal with hydrochloric acid and then mixing therewith a relatively small amount of tartaric acid to prevent gelatinization of the silicon compounds whereby such acid solution is stabilized.

12. In the production of a stabilized acid solution containing soluble compounds of zirconium, silicon and of a metal selected from the group consisting of barium, sodium and potassium, the steps which comprise treating an aqueous suspension containing decomposed compounds of steps which comprise treating an aqueous suspension containing decomposed compounds of zirconium, silicon and said metal with hydrochloric acid and then mixing therewith a relatively small amount of sodium zirconium tartrate to prevent gelatinization of the silicon compounds whereby such acid solution is stabilized.

14. In the method of stabilizing a mineral acid zirconium solution containing soluble compounds of silicon and of a metal selected from the group consisting of barium, sodium and potassium, the step which consists in incorporating in said solution a readily water-soluble organic compound selected from the group consisting of tartaric acid, citric acid, and sodium zirconium tartrate.

15. In the method of stabilizing a mineral acid zirconium solution containing soluble compounds of silicon and of a metal selected from the group consisting of barium, sodium and potassium, the step which consists in incorporating in said solution tartaric acid.

16. As a new article, a stabilized acid zirconium solution containing soluble compounds of zirconium and silicon and also soluble salts of a metal of the group consisting of barium, sodium and potassium combined with not less than 0.10% of a water-soluble carbon compound derived from the group consisting of tartaric acid, citric acid and sodium zirconium tartrate.

17. As a new article, a stabilized chloride zirconium solution containing soluble compounds of zirconium and silicon and also soluble salts oi. a metal of the group consisting of barium, sodium and potassium combined with not less than 0.10% of a water-soluble carbon compound derived from the group consisting of tartaric acid, citric acid, and sodium zirconium tartrate.

18. As a new article, a stabilized nitrate zirconium solution containing soluble compounds of zirconium and silicon and also soluble salts of a metal of the group consisting of barium, sodium and potassium combined with not less than 0.10% 'of' a water-soluble carbon compound derived from the group consisting of tartaric acid, citric acid, and sodium zirconium tartrate.

19. As a new article, a stabilized sulphate zirconium solution containing soluble compounds of zirconium and silicon and also soluble salts of a metai of the group consisting of sodium and potassium combined with not less than 0.10% of a water-soluble carbon compound derived from the group consisting of tartaric acid, citric acid, and sodium zirconium tartrate.

20. As a new article, a stabilized acid zirconium solution containing soluble compounds of zirconium and silicon and also soluble salts of barium combined with not less than 0.10% of a Watersoluble carbon compound derived from the group consisting of tartaric acid, citric acid, and sodium zirconium tartrate. V

21. As a new article, a stabilized chloride zirconium solution containing soluble compounds of zirconium and silicon and also soluble salts of sodium combined with not less than 0.10% of a water-soluble carbon compound derived from the group consisting of tartaric acid, citric acid, and sodium zirconium tartrate.

22. As a new article, a stabilized chloride zirconium solution containing soluble compounds of zirconium and silicon and also soluble salts of barium combined with not less than 0.10% of a water-soluble carbon compound derived from the group consisting of tartaric acid, citric acid, and sodium zirconium tartrate.

CHARLESJ. KINZIE. 

